Ford is recalling nearly 900,000 of its F-150 and F-Super Duty pickups in the United States and Canada due to a fire concern with the trucks' engine block heaters.

The recall affects 2015 to 2019 model Ford-150 trucks and 2017 to 2019 model F-Super Duty vehicles, according to documents the company submitted to the National Highway Traffic Safety Administration.

Owners rely on the block heater to keep their engines warm so the vehicle starts properly in cold weather, CBS News reported. The block heater cable hangs from the truck and can be plugged into an outlet in a home garage.

According to Ford's report, water and other contaminants can corrode the cable's splice connector, leading to a short or making the block heater inoperable.

The fire risk only exists when the truck is parked and the block heater cable is plugged into an electrical outlet, the report states.

The problem was discovered in October when the company had three reports of fires involving trucks in Canada, Forbes reported. The company isn't aware if there have been fires in the U.S.

Ford's F-Series pickups are the top-selling vehicle in the country, according to The Associated Press.